Anytime I increase my hours of working out per week even by about an hour, I'm more tired. I know this because I was trying to move from 3 to about 5 hours/week of exercise all this term (since about Feb) for my summer tris and I was pooped. I'm still a bit tired, but it's getting better. That's not much compared to what you're doing, but any increase over an hour I reallly feel for awhile.
Tri training programs have cut-back weeks in them. That works for me!
For me that means extra sleep.



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